(Possibly related to MC-12596)
In a particular area of my minecart railroad, I keep getting a large amount of lag. 'root.tick.connection.checkLight' keeps eating up all the CPU time, resulting in video for half a second, followed by two seconds of video being frozen.
The area has not always behaved like this.
The associated save has you travelling south by minecart, nearing a right turn to the west (which heads to my base). The lag seems to occur mainly on the north-south segment, though orientation probably has nothing to do with the issue.
A good amount of the rail is underwater, though the lag also occurs above sea level.
I believe the minecart is unrelated to the issue - IIRC I once got out and still had the lag.
The savegame, too large to upload, is located at
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Okay, please mark as invalid, resolved, or whatever. Updating the Java seems to have fixed it. Walked and rode the length without significant time in root.tick .
Could reproduce with your world but with current Java 7U17, even when digging from the tunnel straight upwards over the ocean.
Related to MC-17203?
Just realised my Java is outdated, updating it, will check again.